MIL-DTL-14072F
TABLE V. Electrical conductivity of passivated finishes (see para 3.12) - continued.
Alloy Part
Type
Finish
Finish
Remarks
Conducting
Exposure
Number
Frequency
Power RF
Zinc-base
II
E612
Phosphate
No
No
Since this finish is
passivation
porous, its use in
contact with other
metals must be
restricted to those
forming couples
compatible with
zinc base alloys.
1/ Chromate films, depending on thickness, have a relatively low electrical resistance
from 0.0001 to 0.002 ohm (.1 to 2 milliohm) over a contact area of 6.45 cm2 with
contact pressure of 7.03 kg per cm2.
2/ Touch up may be required around areas where toothed type lockwashers are located.
Use additional chromate conversion coating (chemical film) applied via brush to seal
outside surfaces of mechanical fasteners and all abraded areas.
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